CN112367748B - Floating type buck-boost PFC circuit and LED driving power supply - Google Patents
Floating type buck-boost PFC circuit and LED driving power supply Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/355—Power factor correction [PFC]; Reactive power compensation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/375—Switched mode power supply [SMPS] using buck topology
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a floating buck-boost PFC circuit and an LED driving power supply. The floating type buck-boost PFC circuit comprises a filter circuit, a rectifier bridge, a PFC control chip, a voltage sampling circuit and a PFC correction circuit, wherein the PFC correction circuit comprises a switch tube Q1 and a switch tube Q2 with the withstand voltage of 600V-650V, an energy storage inductor T1, a fly-wheel diode D0, a fly-wheel diode D1, an electrolytic capacitor E1 with the withstand voltage of 400V-450V, a resistor R0 and a capacitor C1. The LED driving power supply comprises a DC/DC conversion circuit, an LLC control chip, an LED voltage/current sampling circuit and the floating buck-boost PFC circuit. Compared with the traditional PFC circuit, the floating type buck-boost PFC circuit provided by the invention has the characteristics of simple circuit, few devices, high conversion efficiency, higher stability and lower product cost.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a floating buck-boost PFC circuit and an LED driving power supply.
Background
Generally, the dc voltage of the grid input 480Vac after being rectified by the rectifier bridge is close to 680V (480x1.414), and considering the 10% margin of the conventional design, the operating dc voltage of the circuit is close to 750V. The requirements on the service life of the capacitor and ripple current are met, the technical bottleneck of a single electrolytic capacitor in the current stage is smaller than the working voltage of 600V, and a plurality of capacitors with the specification of 400V-450V are connected in series and in parallel for use in the common method, so that the cost is high, and the product volume is large; in addition, the required voltage of the semiconductor switch tube also needs to be increased from 600V-650V to 900-1 KV, which results in higher cost.
Disclosure of Invention
The invention aims to provide a floating type buck-boost PFC circuit and an LED driving power supply which are few in used devices and low in cost.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a floating type buck-boost PFC circuit comprises a filter circuit, a rectifier bridge, a PFC control chip, a voltage sampling circuit and a PFC correction circuit, wherein the PFC correction circuit comprises a switch tube Q1 and a switch tube Q2 with the withstand voltage of 600V-650V, an energy storage inductor T1, a fly-wheel diode D0, a fly-wheel diode D1, an electrolytic capacitor E1 with the withstand voltage of 400V-450V, a resistor R0 and a capacitor C1,
an external alternating voltage is connected with the input end of the rectifier bridge through the filter circuit, the positive output end of the rectifier bridge is respectively connected with the drain electrode of the switch tube Q1 and one end of the capacitor C1, the source electrode of the switch tube Q1 is respectively connected with one input end of the energy storage inductor T1 and one end of the electrolytic capacitor E1, and one end of the electrolytic capacitor E1 is grounded; one output end of the energy storage inductor T1 is connected with the anode of the fly-wheel diode D0 and the drain electrode of the switch tube Q2 respectively, the cathode of the fly-wheel diode D0 is connected with the other end of the electrolytic capacitor E1 through the fly-wheel diode D1, and the other end of the electrolytic capacitor E1 is connected with the input end of the voltage sampling circuit; the output end of the voltage sampling circuit is connected with the input end of the PFC control chip through an optical coupling isolator U1, and the output end of the PFC control chip is connected with a primary side coil in an isolation driving winding T0;
the source electrode of the switching tube Q2 is connected with one end of the resistor R0, the grid electrode of the switching tube Q2 is connected with one end of the first secondary coil in the isolation driving winding T0 through the resistor R2, and the other end of the first secondary coil in the isolation driving winding T0 is connected with the other end of the resistor R0; the grid of the switching tube Q1 is connected with one end of a second secondary coil in the isolation driving winding T0 through a resistor R1, and the other end of the second secondary coil in the isolation driving winding T0, the other end of the resistor R0, the other input end in the energy storage inductor T1 and the other end of the capacitor C1 are all grounded.
Compared with the traditional PFC circuit, the floating boost-buck PFC circuit provided by the application outputs 400Vdc direct current voltage (adjustable) after a 480Vac voltage circuit input by a power grid is rectified, filtered and corrected, and can also meet international and domestic product standards by only using a single conventional electrolytic capacitor E1 with withstand voltage of 400-450V and conventional semiconductor switch tubes Q1 and Q2 with withstand voltage of 600-650V.
In one embodiment, the PFC correction circuit further includes a voltage-sensitive device MOV1 and a voltage-sensitive device MOV2, the voltage-sensitive device MOV1 is connected in parallel between the source and the drain of the switching tube Q1, one end of the voltage-sensitive device MOV2 is connected to the other end of the electrolytic capacitor E1, and the other end of the voltage-sensitive device MOV2 is grounded.
In one embodiment, the PFC control chip is a CRM mode PFC chip with model number L6562 NCL 2801.
In one embodiment, the filter circuit includes a capacitor CX1, a common mode inductor LF1, a capacitor Y1, and a capacitor Y2, an L end of an external ac voltage is connected to the first end of the capacitor CX1 and an input end of the common mode inductor LF1, respectively, and an output end of the common mode inductor LF1 is connected to the first end of the capacitor Y1 and an anode input end of the rectifier bridge, respectively; the N end of external alternating voltage respectively with the second end of electric capacity CX1 another input of common mode inductance LF1 links to each other, another output of common mode inductance LF1 respectively with the first end of electric capacity Y2 the negative pole input of rectifier bridge links to each other.
In one embodiment, the voltage sampling circuit adopts a resistance type voltage sampling circuit; the optical coupling isolator U1 adopts an optical coupler with the model number of OPTOISO 1.
In order to realize the purpose of the invention, the invention also provides the following technical scheme:
an LED driving power supply comprises a DC/DC conversion circuit, an LLC control chip, an LED voltage/current sampling circuit and the floating buck-boost PFC circuit, wherein one input end of the DC/DC conversion circuit is connected with the other end of an electrolytic capacitor E1, the output end of the DC/DC conversion circuit is respectively connected with a power supply end of an LED lamp source array and the input end of the LED voltage/current sampling circuit, the output end of the LED voltage/current sampling circuit is connected with the input end of the LLC control chip through an optical coupling isolator U2, and the output end of the LLC control chip is connected with the other input end of the DC/DC conversion circuit.
In one embodiment, the DC/DC conversion circuit includes a switching tube Q3, a switching tube Q4, a capacitor C0, an adjusting winding T2, and an electrolytic capacitor E2, wherein one end of the electrolytic capacitor E1 is respectively connected to a drain of the switching tube Q3 and one end of a first primary coil in the adjusting winding T2, the other end of the first primary coil in the adjusting winding T2 is connected to one end of the capacitor C0, the other end of the capacitor C0 is connected to a source of the switching tube Q3, and a gate of the switch cabinet Q3 is connected to an output terminal OUT1 of the LLC control chip through a resistor R9; the other end of the electrolytic capacitor E1 is connected with a drain electrode of the switch tube Q4, a source electrode of the switch tube Q4 is respectively connected with the other end of the capacitor C0 and an output end OUT2 of the LLC control chip, and a grid electrode of the switch cabinet Q4 is connected with an output end OUT3 of the LLC control chip through a resistor R10; one end of a second primary coil in the regulating winding T2 is connected with the anode of a diode D6, the other end of the second primary coil in the regulating winding T2 is connected with one end of a capacitor C2, and the cathode of the diode D6 and the other end of the capacitor C2 are respectively connected with a power supply end;
one end of a first secondary coil in the adjusting winding T2 is connected with the anode of the diode D4, the other end of the first secondary coil in the adjusting winding T2 is connected with the anode of the diode D5, the adjusting end of the first secondary coil in the adjusting winding T2 is connected with one end of the electrolytic capacitor E2, the other end of the electrolytic capacitor E2 is respectively connected with the cathode of the diode D4 and the cathode of the diode D5, the anode power input end of the LED lamp source array is connected with the other end of the electrolytic capacitor E2, and the cathode power input end of the LED lamp source array is connected with one end of the electrolytic capacitor E2.
In one embodiment, the LLC control chip is an LLC control chip with model number L6599 NCP 1399.
In one embodiment, the LED voltage/current sampling circuit adopts an operational amplifier type voltage/current sampling circuit; the optical coupling isolator U2 adopts an optical coupler with the model number of OPTOISO 1.
Drawings
Fig. 1 is a schematic diagram of a circuit of a floating buck-boost PFC circuit according to an embodiment;
fig. 2 is a schematic circuit diagram of an LED driving power supply according to an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature.
Referring to fig. 1, the invention provides a floating type buck-boost PFC circuit, which comprises a filter circuit 100, a rectifier bridge BD1, a PFC control chip 400, a voltage sampling circuit 300 and a PFC correction circuit 200, wherein the PFC correction circuit 200 comprises a switching tube Q1 and a switching tube Q2 with the withstand voltage of 600V-650V, an energy storage inductor T1, a freewheeling diode D0, a freewheeling diode D1, an electrolytic capacitor E1 with the withstand voltage of 400V-450V, a resistor R0 and a capacitor C1.
The external alternating voltage is connected with the input end of a rectifier bridge BD1 through a filter circuit 100, the positive electrode output end of the rectifier bridge BD1 is respectively connected with the drain electrode of a switch tube Q1 and one end of a capacitor C1, the source electrode of the switch tube Q1 is respectively connected with one input end of an energy storage inductor T1 and one end of an electrolytic capacitor E1, and one end of the electrolytic capacitor E1 is grounded; an output end of the energy storage inductor T1 is respectively connected with an anode of a fly-wheel diode D0 and a drain electrode of a switch tube Q2, a cathode of the fly-wheel diode D0 is connected with the other end of an electrolytic capacitor E1 through the fly-wheel diode D1, and the other end of the electrolytic capacitor E1 is connected with an input end of a voltage sampling circuit 300; the output end of the voltage sampling circuit 300 is connected with the input end of the PFC control chip 400 through an optical coupling isolator U1, and the output end of the PFC control chip 400 is connected with a primary side coil in the isolation driving winding T0;
the source electrode of the switching tube Q2 is connected with one end of the resistor R0, the grid electrode of the switching tube Q2 is connected with one end of a first secondary coil in the isolation driving winding T0 through the resistor R2, and the other end of the first secondary coil in the isolation driving winding T0 is connected with the other end of the resistor R0; the grid of the switching tube Q1 is connected with one end of a second secondary coil in the isolation driving winding T0 through a resistor R1, and the other end of the second secondary coil in the isolation driving winding T0, the other end of the resistor R0, the other input end in the energy storage inductor T1 and the other end of the capacitor C1 are all grounded.
Specifically, the PFC control chip 400 may adopt a CRM mode PFC chip with a model number of L6562 NCL 2801; the filter circuit 100 adopts an EMI filter circuit, which may include a capacitor CX1, a common mode inductor LF1, a capacitor Y1, and a capacitor Y2, wherein an L-terminal of an external alternating voltage is connected to a first terminal of the capacitor CX1 and an input terminal of the common mode inductor LF1, respectively, and an output terminal of the common mode inductor LF1 is connected to a first terminal of the capacitor Y1 and an anode input terminal of the rectifier bridge BD1, respectively; the N end of the external alternating voltage is respectively connected with the second end of the capacitor CX1 and the other input end of the common-mode inductor LF1, and the other output end of the common-mode inductor LF1 is respectively connected with the first end of the capacitor Y2 and the negative input end of the rectifier bridge BD 1; the voltage sampling circuit 300 may employ a resistive voltage sampling circuit; optical coupler isolator U1 may be an opto iso1 type optical coupler.
Further, the PFC correction circuit 200 may further include a voltage-sensitive device MOV1 and a voltage-sensitive device MOV2, the voltage-sensitive device MOV1 is connected in parallel between the source and the drain of the switching tube Q1, one end of the voltage-sensitive device MOV2 is connected to the other end of the electrolytic capacitor E1, and the other end of the voltage-sensitive device MOV2 is grounded.
The present embodiment mainly solves the problem that the implementation method is a voltage reduction method of the PFC correction circuit 200, which provides a lower working voltage (400V in the present circuit) for the subsequent stage while implementing the active power factor correction function. In the circuit diagram, a PFC correction circuit is composed of 2 600-650V switching tubes Q1 and Q2, an energy storage inductor T1 (with a switch zero crossing point detection winding), a freewheeling diode D0/D1, a single 400-450V capacitor E1 and the like. The voltage output by the PFC correction circuit 200 is isolated by the optical coupling isolator U1 and then transmitted to the PFC control chip 400, the switching tubes Q1 and Q2 are driven to carry out switching control in a magnetic field isolation mode, and the voltage-sensitive devices MOV1 and MOV2 carry out surge protection. The key technical point of the embodiment is different from the use of the traditional diode D2/D3 (the diode D2/D3 is not used in the embodiment), the negative electrode of the electrolytic capacitor E1 is not communicated with the negative electrode of the rectifier bridge BD1, and the voltage drop and the switching loss of the D2/D3 do not exist, so that the device is saved, and the power conversion efficiency and the reliability are improved.
Compared with the traditional PFC circuit, the floating type buck-boost PFC circuit provided by the embodiment outputs 400Vdc direct current voltage (adjustable) after a 480Vac voltage circuit input by a power grid is rectified, filtered and corrected, and can also meet international and domestic product standards by only using a single conventional electrolytic capacitor E1 with the withstand voltage of 400-450V and conventional semiconductor switching tubes Q1 and Q2 with the withstand voltage of 600-650V.
Referring to fig. 2, the present invention further provides an LED driving power supply, which includes a DC/DC conversion circuit 500, an LLC control chip 700, an LED voltage/current sampling circuit 600, and the floating buck-boost PFC circuit as described above, wherein an input end of the DC/DC conversion circuit 500 is connected to the other end of the electrolytic capacitor E1, an output end of the DC/DC conversion circuit 500 is connected to a power end of the LED lamp source array and an input end of the LED voltage/current sampling circuit 600, an output end of the LED voltage/current sampling circuit 600 is connected to an input end of the LLC control chip 700 through an optical coupling isolator U2, and an output end of the LLC control chip 700 is connected to another input end of the DC/DC conversion circuit 500.
Specifically, the DC/DC conversion circuit 500 may include a switching tube Q3, a switching tube Q4, a capacitor C0, an adjusting winding T2, and an electrolytic capacitor E2, wherein one end of the electrolytic capacitor E1 is connected to a drain of the switching tube Q3 and one end of a first primary coil in the adjusting winding T2, respectively, the other end of the first primary coil in the adjusting winding T2 is connected to one end of the capacitor C0, the other end of the capacitor C0 is connected to a source of the switching tube Q3, and a gate of the switch cabinet Q3 is connected to an output terminal OUT1 of the LLC control chip 700 through a resistor R9; the other end of the electrolytic capacitor E1 is connected with the drain electrode of a switch tube Q4, the source electrode of the switch tube Q4 is respectively connected with the other end of the capacitor C0 and the output end OUT2 of the LLC control chip 700, and the grid electrode of the switch cabinet Q4 is connected with the output end OUT3 of the LLC control chip 700 through a resistor R10; one end of a second primary coil in the regulating winding T2 is connected with the anode of the diode D6, the other end of the second primary coil in the regulating winding T2 is connected with one end of the capacitor C2, and the cathode of the diode D6 and the other end of the capacitor C2 are respectively connected with a power supply end; one end of a first secondary coil in the adjusting winding T2 is connected with the anode of the diode D4, the other end of the first secondary coil in the adjusting winding T2 is connected with the anode of the diode D5, the adjusting end of the first secondary coil in the adjusting winding T2 is connected with one end of the electrolytic capacitor E2, the other end of the electrolytic capacitor E2 is respectively connected with the cathode of the diode D4 and the cathode of the diode D5, the anode power input end of the LED lamp source array is connected with the other end of the electrolytic capacitor E2, and the cathode power input end of the LED lamp source array is connected with one end of the electrolytic capacitor E2.
The LLC control chip 700 can adopt an LLC control chip with the model number of L6599 NCP 1399; the LED voltage/current sampling circuit 600 may be an operational amplifier type voltage/current sampling circuit, which includes an operational amplifier U10A and an operational amplifier U10B; optical coupler isolator U2 may be an opto-coupler model number optiso 1.
The working principle of the LED driving power supply provided by this embodiment is as follows: the alternating current of the power grid passes through the filter circuit 100, noise waves in the power grid are filtered, electromagnetic interference to the outside is reduced, the rectifier bridge BD1 rectifies the voltage of the power grid into direct current voltage, the direct current voltage is obtained through the PFC correction circuit 200, the voltage with adjustable pulse width is output through the rear-stage DC/DC conversion circuit 500, the direct current voltage is output through the diode D4/D5 to supply power to the LED lamp source array, and the magnitude of the voltage and the current output by the power supply is controlled by a feedback signal of the operational amplifier U10A/U10B.
The optical coupling isolator U1/U2 and the isolation driving winding T0 finish the isolation of strong electricity and control signals, so that the LLC control chip 700 and the DC/DC conversion circuit 500 finish the isolation, and the stability of the driving circuit is improved; the LED voltage/current sampling circuit 600 collects the voltage and current of the LED lamp source array in real time and feeds the voltage and current back to the LLC control chip 700, and the LLC control chip 700 adjusts the output PWM signal in real time to change the working state of the lamp in real time.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (9)
1. A floating type buck-boost PFC circuit comprises a filter circuit, a rectifier bridge, a PFC control chip and a voltage sampling circuit, and is characterized by further comprising a PFC correction circuit, wherein the PFC correction circuit comprises a switch tube Q1 and a switch tube Q2 with withstand voltage of 600V-650V, an energy storage inductor T1, a fly-wheel diode D0, a fly-wheel diode D1, an electrolytic capacitor E1 with withstand voltage of 400V-450V, a resistor R0 and a capacitor C1,
an external alternating voltage is connected with the input end of the rectifier bridge through the filter circuit, the positive electrode output end of the rectifier bridge is respectively connected with the drain electrode of the switch tube Q1 and one end of the capacitor C1, the source electrode of the switch tube Q1 is respectively connected with one input end of the energy storage inductor T1 and one end of the electrolytic capacitor E1, and one end of the electrolytic capacitor E1 is grounded; one output end of the energy storage inductor T1 is connected with the anode of the fly-wheel diode D0 and the drain of the switching tube Q2 respectively, the cathode of the fly-wheel diode D0 is connected with the other end of the electrolytic capacitor E1 through the fly-wheel diode D1, and the other end of the electrolytic capacitor E1 is connected with the input end of the voltage sampling circuit; the output end of the voltage sampling circuit is connected with the input end of the PFC control chip through an optical coupling isolator U1, and the output end of the PFC control chip is connected with a primary side coil in an isolation driving winding T0;
the source electrode of the switching tube Q2 is connected with one end of the resistor R0, the grid electrode of the switching tube Q2 is connected with one end of the first secondary coil in the isolation driving winding T0 through the resistor R2, and the other end of the first secondary coil in the isolation driving winding T0 is connected with the other end of the resistor R0; the grid electrode of the switch tube Q1 is connected with one end of a second secondary coil in the isolation driving winding T0 through a resistor R1, and the other end of the second secondary coil in the isolation driving winding T0, the other end of the resistor R0, the other input end in the energy storage inductor T1 and the other end of the capacitor C1 are all grounded.
2. The floating buck-boost PFC circuit of claim 1, further comprising a voltage-sensitive device MOV1 and a voltage-sensitive device MOV2, wherein the voltage-sensitive device MOV1 is connected in parallel between the source and the drain of the switch tube Q1, one end of the voltage-sensitive device MOV2 is connected with the other end of the electrolytic capacitor E1, and the other end of the voltage-sensitive device MOV2 is grounded.
3. The floating buck-boost PFC circuit of claim 1, wherein the PFC control chip is a CRM mode PFC chip having a model number of L6562 NCL 2801.
4. The floating buck-boost PFC circuit of claim 1, wherein the filter circuit comprises a capacitor CX1, a common mode inductor LF1, a capacitor Y1 and a capacitor Y2, an L terminal of an external ac voltage is respectively connected to the first terminal of the capacitor CX1 and an input terminal of the common mode inductor LF1, and an output terminal of the common mode inductor LF1 is respectively connected to the first terminal of the capacitor Y1 and a positive input terminal of the rectifier bridge; the N end of external alternating voltage respectively with the second end of electric capacity CX1 another input of common mode inductance LF1 links to each other, another output of common mode inductance LF1 respectively with the first end of electric capacity Y2 the negative pole input of rectifier bridge links to each other.
5. The floating buck-boost PFC circuit of claim 1, wherein the voltage sampling circuit employs a resistive voltage sampling circuit; the optical coupling isolator U1 adopts an optical coupler with the model number of OPTOISO 1.
6. An LED driving power supply, characterized by comprising a DC/DC conversion circuit, an LLC control chip, an LED voltage/current sampling circuit and the floating buck-boost PFC circuit as claimed in any one of claims 1 to 5, wherein one input end of the DC/DC conversion circuit is connected with the other end of the electrolytic capacitor E1, the output end of the DC/DC conversion circuit is respectively connected with the power end of an LED lamp source array and the input end of the LED voltage/current sampling circuit, the output end of the LED voltage/current sampling circuit is connected with the input end of the LLC control chip through an optical coupling isolator U2, and the output end of the LLC control chip is connected with the other input end of the DC/DC conversion circuit.
7. The LED driving power supply according to claim 6, wherein the DC/DC conversion circuit comprises a switching tube Q3, a switching tube Q4, a capacitor C0, an adjusting winding T2 and an electrolytic capacitor E2, wherein one end of the electrolytic capacitor E1 is respectively connected with a drain electrode of the switching tube Q3 and one end of a first primary coil in the adjusting winding T2, the other end of the first primary coil in the adjusting winding T2 is connected with one end of the capacitor C0, the other end of the capacitor C0 is connected with a source electrode of the switching tube Q3, and a gate of the switching tube Q3 is connected with an output end OUT1 of the LLC control chip through a resistor R9; the other end of the electrolytic capacitor E1 is connected with a drain electrode of the switch tube Q4, a source electrode of the switch tube Q4 is respectively connected with the other end of the capacitor C0 and an output end OUT2 of the LLC control chip, and a grid electrode of the switch tube Q4 is connected with an output end OUT3 of the LLC control chip through a resistor R10; one end of a second primary coil in the regulating winding T2 is connected with the anode of a diode D6, the other end of the second primary coil in the regulating winding T2 is connected with one end of a capacitor C2, and the cathode of the diode D6 and the other end of the capacitor C2 are respectively connected with a power supply end;
one end of a first secondary coil in the adjusting winding T2 is connected with the anode of the diode D4, the other end of the first secondary coil in the adjusting winding T2 is connected with the anode of the diode D5, the adjusting end of the first secondary coil in the adjusting winding T2 is connected with one end of the electrolytic capacitor E2, the other end of the electrolytic capacitor E2 is respectively connected with the cathode of the diode D4 and the cathode of the diode D5, the anode power input end of the LED lamp source array is connected with the other end of the electrolytic capacitor E2, and the cathode power input end of the LED lamp source array is connected with one end of the electrolytic capacitor E2.
8. The LED driving power supply according to claim 6, wherein the LLC control chip is of a type L6599 NCP 1399.
9. The LED driving power supply according to claim 6, wherein the LED voltage/current sampling circuit is an operational amplifier type voltage/current sampling circuit; the optical coupling isolator U2 adopts an optical coupling with the model number OPTOISO 1.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011466824.XA CN112367748B (en) | 2020-12-14 | 2020-12-14 | Floating type buck-boost PFC circuit and LED driving power supply |
| US18/016,722 US20230309206A1 (en) | 2020-12-14 | 2021-10-20 | Floating type boost-buck pfc circuit and led drive power supply |
| PCT/CN2021/124981 WO2022127351A1 (en) | 2020-12-14 | 2021-10-20 | Floating buck-boost pfc circuit and led driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011466824.XA CN112367748B (en) | 2020-12-14 | 2020-12-14 | Floating type buck-boost PFC circuit and LED driving power supply |
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| CN112367748A CN112367748A (en) | 2021-02-12 |
| CN112367748B true CN112367748B (en) | 2022-11-22 |
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| CN202011466824.XA Active CN112367748B (en) | 2020-12-14 | 2020-12-14 | Floating type buck-boost PFC circuit and LED driving power supply |
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| Country | Link |
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| US (1) | US20230309206A1 (en) |
| CN (1) | CN112367748B (en) |
| WO (1) | WO2022127351A1 (en) |
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| CN112367748B (en) * | 2020-12-14 | 2022-11-22 | 深圳市华浩德电子有限公司 | Floating type buck-boost PFC circuit and LED driving power supply |
| CN114340092B (en) * | 2021-12-29 | 2024-09-27 | 上海晶丰明源半导体股份有限公司 | Full-voltage sampling circuit, driving chip, LED driving circuit and sampling method |
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| US7425803B2 (en) * | 2004-08-31 | 2008-09-16 | Stmicroelectronics, Inc. | Method and circuit for driving a low voltage light emitting diode |
| US7911812B2 (en) * | 2007-01-22 | 2011-03-22 | Power Integrations, Inc. | Control arrangement for a PFC power converter |
| US8619442B2 (en) * | 2007-04-06 | 2013-12-31 | Robert S. Wrathall | Boost-buck power factor correction |
| US7952293B2 (en) * | 2008-04-30 | 2011-05-31 | Lsi Industries, Inc. | Power factor correction and driver circuits |
| KR100987403B1 (en) * | 2008-12-23 | 2010-10-14 | 카멜테크 주식회사 | Power supply device for led |
| JP5581808B2 (en) * | 2010-05-27 | 2014-09-03 | サンケン電気株式会社 | DC power supply |
| US8508958B2 (en) * | 2011-04-01 | 2013-08-13 | Power Integrations, Inc. | LLC controller with programmable fractional burst frequency |
| US8884548B2 (en) * | 2013-02-28 | 2014-11-11 | Asahi Kasei Microdevices Corporation | Power factor correction converter with current regulated output |
| JP6130692B2 (en) * | 2013-03-07 | 2017-05-17 | 株式会社小糸製作所 | Semiconductor light source lighting circuit and vehicle lamp |
| CN103716952B (en) * | 2013-09-17 | 2015-12-02 | 宁波凯耀电器制造有限公司 | A kind of LED switch power supply and control method thereof |
| CN105186892B (en) * | 2014-05-27 | 2018-06-08 | 晶宝智电科技有限公司 | Numerical digit AC/DC power supply changeover devices |
| US9237621B1 (en) * | 2014-08-22 | 2016-01-12 | Universal Lighting Technologies, Inc. | Current control circuit and method for floating IC driven buck-boost converter |
| CN204069441U (en) * | 2014-09-03 | 2014-12-31 | 深圳市茂捷半导体有限公司 | LED illumination non-isolated drive circuit |
| CN106533194A (en) * | 2016-12-15 | 2017-03-22 | 广东百事泰电子商务股份有限公司 | PFC forward full-bridge-based intelligent type correction filtering voltage conversion circuit |
| CN206620057U (en) * | 2017-01-04 | 2017-11-07 | 广东百事泰电子商务股份有限公司 | Intelligent amendment wave voltage change-over circuit based on PFC, full-bridge and half-bridge |
| CN206498565U (en) * | 2017-02-21 | 2017-09-15 | 浙江永耀灯饰有限公司 | A kind of LED drive power |
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| CN216626106U (en) * | 2019-09-10 | 2022-05-27 | 嘉兴山蒲照明电器有限公司 | LED lamp and dimmer, driving device, lamp holder, dimming panel, power adapter and lighting system thereof |
| CN110707932A (en) * | 2019-10-08 | 2020-01-17 | 朝阳市加华电子有限公司 | Integrated PFC high-voltage half-bridge resonance synchronous rectification AC/DC power module |
| CN112367748B (en) * | 2020-12-14 | 2022-11-22 | 深圳市华浩德电子有限公司 | Floating type buck-boost PFC circuit and LED driving power supply |
-
2020
- 2020-12-14 CN CN202011466824.XA patent/CN112367748B/en active Active
-
2021
- 2021-10-20 US US18/016,722 patent/US20230309206A1/en active Pending
- 2021-10-20 WO PCT/CN2021/124981 patent/WO2022127351A1/en active Application Filing
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| WO2022127351A1 (en) | 2022-06-23 |
| US20230309206A1 (en) | 2023-09-28 |
| CN112367748A (en) | 2021-02-12 |
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